Chapter 3, Problem 3.9P

Interpretation Introduction

Interpretation: The value of viscosity of crude oil is to be determined above which it will show laminar flow.

Concept introduction: Viscosity is the resistance to the motion of fluid which doesn’t allow it to move in a given direction.

The flow of a fluid is said to be Laminar when it is moving at a low speed with a streamline motion. The laminar flow can be shown by the Reynold’s number of a fluid.

  $\text{Re = }\frac{\text{ρvD}}{\text{μ}}$ ……. (1)

In the given formulae, the notations used are,

  $\begin{array}{l}\text{Re is the Reynold's Number}\\ \text{ρ = Density of fluid}\\ \text{v = Average Velocity of fluid}\\ \text{D = Diameter of pipeline in which fluid is moving}\\ \text{μ = Viscosity of fluid}\end{array}$

For laminar flow critical value of Reynold’s number is 2100.